The garbage enzymes produced from preconsumer organic waste containing multi hydrolytic enzyme activity which helps to solubilize the waste activated sludge. The continuous production of garbage enzyme and its scaling up process need a globe optimized condition. In present study the effect of fruit peel composition and sonication time on enzyme activity were investigated. Garbage enzyme produced from 6 g pineapple peels: 4 g citrus peels pre-treated with ultrasound for 20 min shows higher hydrolytic enzymes activity. Simultaneously statistical optimization tools were used to model garbage enzyme production with higher activity of amylase, lipase and protease. The maximum activity of amylase, lipase and protease were predicted to be 56.409, 44.039, 74.990 U/ml respectively at optimal conditions (pH (6), temperature (37 degrees C), agitation (218 RPM) and fermentation duration (3 days)). These optimized conditions can be successfully used for large scale production of garbage enzyme with higher hydrolytic enzyme activity. (C) 2016 Elsevier Ltd. All rights reserved.